Following histograms should be recorded that indicate the data use of tabs in background vs. foreground.
DataUse.AppBackground
DataUse.AppForeground.TabBackground
DataUse.AppForeground.TabForeground
Following histograms should be recorded that indicate the content type of the data use.
DataUse.ContentType.[User|System].[Background|Foreground]
MainFrameHTML
NonMainFrameHTML
CSS
Image
Javascript
Font
AudioForegroundTab
AudioBackgroundTab
AudioBackgroundApp
VideoForegroundTab
VideoBackgroundTab
VideoBackgroundApp
Other